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To ARC or not to ARC? What are the pros and cons? [closed]
...n't become a decent intermediate programmer. You need to know the rules in order to bridge correctly with Core Foundation, and every intermediate programmer needs to deal with CF at some point. And you need to know the rules for mixed-ARC/MRC code. And you need to know the rules when you start messi...
lenses, fclabels, data-accessor - which library for structure access and mutation is better
...wtype T r a = Cons { decons :: a -> r -> (a, r) }
Consequently, in order to get the value of a lens, you must submit an undefined value for the 'a' argument! This strikes me as an incredibly ugly and ad hoc implementation.
That said, Henning has included the template-haskell plumbing to aut...
Can dplyr package be used for conditional mutating?
...== 4, g := 3L]
df[a %in% c(2,5,7) | (a==1 & b==4), g := 2L]
Note the order of conditional statements is reversed to get g correctly. There's no copy of g made, even during the second assignment - it's replaced in-place.
On larger data this would have better performance than using nested if-el...
What is Mocking?
...t error)
This creating imaginary—similar to real is known as mocking.
In order to do this, you can't use your original code (your original code doesn't have the pre-inserted responses, right?). You must add something to it, inject/insert that dummy data which isn't normally needed (or a part of yo...
Export query result to .csv file in SQL Server 2008
...utput mode, it doesn't affect the results if you already ran the query. In order for this to be reflected, you have to re-run the query. When you run it in "Results to File" mode, it should prompt you for where you would like to save the results.
– qJake
Jul 17...
Why does my application spend 24% of its life doing a null check?
...npractical. Not in the least because you typically cannot predict in which order the nodes of the tree will be visited. A red-black tree might help, it isn't clear from the question. So a simple conclusion to draw is that it is already running as fast you can hope for. And if you need it to go faste...
Generate pdf from HTML in div using Javascript
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jsPDF is able to use plugins. In order to enable it to print HTML, you have to include certain plugins and therefore have to do the following:
Go to https://github.com/MrRio/jsPDF and download the latest Version.
Include the following Scripts in your proje...
php $_POST array empty upon form submission
...vars (it's only available on very old PHP versions) is set to On
variables_order contains the letter P
post_max_size is set to a reasonable value (e.g. 8 MB)
(if using suhosin patch) suhosin.post.max_vars and suhosin.request.max_vars are large enough.
I suppose the second suggestion of mine will s...
Convert base class to derived class [duplicate]
...mmend that. Take a look at the Decorator Pattern if you want to do this in order to extend the functionality of an existing object.
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Proper way to use AJAX Post in jquery to pass model from strongly typed MVC3 view
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In order to use the serialize function, my understanding is that each member of the class needs to be used in a form object. If that is correct, I may be SOL.
– John Stone
May 12 '11 at 18...